Hello Stichtingstaal,
1) A) To set up the Blue Menus head to:
Appearance > Menus
B) Click The plus (if you hover over it, it will say "Add Menu"), give it a name and press "Save".
C) To the left of that should be some smaller boxes, find the one labelled "Pages", click "View All and select "Home" (You can add more later) and then "Add To Menu". It should appear on the right, click "Save Menu".
D) Then go to the "Theme Locations" box and under "Primary" select your menu" and press save.
E) If you go to your WordPress site "home" should appear =]
2) A) To set up the Black Menus head to:
Appearance > Menus
B) Click the plus again, give it a name and press "Save"
C) To the left of that should be some smaller boxes, find the one labelled "categories", click "View All and select "Uncategorized" and then "Add To Menu". It should appear on the right, click "Save Menu".
D) Then go to the "Theme Locations" box and under "Secondary" select your second menu and press save.
E) If you go to your WordPress site it should appear =]
(Note: For both of these, as you add new pages and categories, you can add these to your menus by ticking them and selecting "add to menu", but dont forget to click "save menu" after editing them.)
Hope this helps =]
Elliot